<template>
    <div>
        <!--面包屑导航-->
       <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!--卡片视图-->
        <el-card>
            <!--提示信息-->
            <el-alert title="添加商品信息" type="info"></el-alert>
            <!--步骤条区域-->
            <el-steps :space="200" align-center :active="activeIndex - 0" finish-status="success">
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
        <!--TAB栏区域-->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
            <el-tabs  v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                <el-tab-pane label="基本信息" name="0">
                    <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item label="商品价格" prop="goods_price">
                        <el-input v-model="addForm.goods_price" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品数量" prop="goods_number">
                        <el-input v-model="addForm.goods_number" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品重量" prop="goods_weight">
                        <el-input v-model="addForm.goods_weight" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品分类" prop="good_cat">
                        <el-cascader expand-trigger='hover'  v-model="addForm.goods_cat" :options="catelist" :props="cateProps" @change="handleChange"></el-cascader>
                    </el-form-item>
                </el-tab-pane>
                
                <el-tab-pane label="商品参数" name="1" >
                    <!--渲染表单的Item项-->
                    <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                        <!--复选框-->
                        <el-checkbox-group v-model="item.attr_vals">
                            <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
                        </el-checkbox-group>
                    </el-form-item>

                </el-tab-pane>
                <el-tab-pane label="商品属性" name="2">
                    <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                        <el-input v-model="item.attr_vals"></el-input>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品图片" name="3">
                    <!--action表示图片要上传的后台API地址-->
                    <el-upload :action="uploadURL" :headers="headerObj" :on-preview="handlePreview" :on-remove="handleRemove"
                         list-type="picture" :on-success="handleSuccess">
                        <el-button size="small" type="primary">点击上传</el-button>
                    </el-upload>
                </el-tab-pane>
                <el-tab-pane label="商品内容" name="4">
                    <!--富文本编辑器组件-->
                    <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                    </el-tab-pane>
            </el-tabs>
        </el-form>
        </el-card>
        <!--图片预览-->
        <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
    </div>
</template>

<script>
import _ from 'lodash'

export default {
    data(){
        return{
            activeIndex: '0',
            //添加商品数据的表单对象
            addForm:{
                goods_name:'',
                goods_price:'',
                goods_number:'',
                goods_weight:'',
                //商品所属的分类数组
                goods_cat:[],
                //图片的数组
                pics:[],
                //商品的详情描述
                goods_introduce:'',
                //
                attrs:[]
            },
            //添加商品数据的表单验证对象
            addFormRules:{
                goods_name:[
                    {required: true, message:'请输入商品名称', trigger:'blur'},         
                ],
                goods_price:[
                    {required: true, message:'请输入商品价格', trigger:'blur'},         
                ],
                goods_weight:[
                    {required: true, message:'请输入商品重量', trigger:'blur'},         
                ],
                goods_number:[
                    {required: true, message:'请输入商品数量', trigger:'blur'},         
                ],
                goods_cat:[
                    {required:true, message:'请选择商品', trigger:'blur'}
                ]
            },
            //获取的商品列表
            catelist:[],
            cateProps:{
                label:'cat_name',
                value:'cat_id',
                children:'children'
            },
            //动态参数列表数据
            manyTableData:[],
            //静态参数列表数据
            onlyTableData:[],
            //上传图片至服务器的URL地址
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            //图片上传组件的headers请求头对象
            headerObj:{
                Authorization: window.sessionStorage.getItem('token')
            },
            //图片预览路径
            previewPath:'',
            previewVisible: false
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        //获取商品分类数据
        async getCateList(){
            const {data:res} = await this.$http.get('categories')

            if(res.meta.status !== 200){
                return this.$message.error('获取商品数据失败');
            }

            this.catelist = res.data
            console.log(this.catelist)
        },
        handleChange(){
            console.log(this.addForm.goods_cat)
            //判断级联选择器中的数据长度是否等于3，以确定只允许选中三级分类
            if(this.addForm.goods_cat.length !==3){
                this.addForm.goods_cat =[]
            }
        },
        beforeTabLeave(activeName,oldActiveName){
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3)
            {
                this.$message.error('请先选择商品分类！')
                return false
            }
        },

        async tabClicked(){
            if(this.activeIndex === '1'){

                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{ sel:'many'}
                })

                if(res.meta.status !== 200){
                    return this.$message.error('获取动态参数列表失败！')
                }
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                });
                console.log(res.data)
                this.manyTableData = res.data
            }else if(this.activeIndex === '2'){
                 const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{ sel:'only'}
                })

                if (res.meta.status !== 200){
                    return this.$message.error('获取静态参数失败！')
                }
                console.log(res.data)
                this.onlyTableData = res.data
            }
        },
        //处理图片的预览效果
        handlePreview(file){
            //1.获取将要预览的图片的URL
            const previewPath = file.response.data.url
            this.previewVisible = true
        },
        //处理移除图片的操作
        handleRemove(file){
            //1获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            //2.从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x =>
            x.pic === filePath)
            //3. 调用数组的splice方法，把图片信息对象，从pics数组中删除
            this.addForm.pics.splice(i,1)
            console.log(this.addForm)
        },
        //
        handleSuccess(response){
            console.log(response)
            //1.拼接得到一个图片信息对象
            const picInfo = {pics: response.data.tmp_path}
            //2.将图片信息对象，push到pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm)
        },
        //添加商品
        add(){
            this.$refs.addFormRef.validate(async valid =>{
                if(!valid){
                    return this.$message.error('请填写必要的表单项')
                }
                //执行添加的业务逻辑
                //lodash cloneDeep(obj)
                const form =  _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                //处理动态参数
                this.manyTableData.forEach(item =>{
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(' ')
                    }
                    this.addForm.attrs.push(newInfo)
                })
                //处理静态属性
                this.onlyTableData.forEach(item => {
                    const newInfo = {
                        attr_id:item.attr_id,
                        attr_value: item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs

                //发起请求添加商品
                //商品的名称，必须是唯一的
                const {data:res} = await this.$http.post('goods',form)
                if(res.meta.status !== 201){
                     return this.$message.error('添加商品失败')
                }

                this.$message.success('添加商品成功')
                this.$router.push('/goods')
            })
        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }
            return null
    }
    },
}
</script>

<style lang="less" scoped>
.el-checkbox{
    margin: 0 10px 0 !important;
}
.previewImg{
    width: 100%;
}
.btnAdd{
    margin-top: 15px;
}
</style>